I'm trying to delete (remove) a guide in my Illustrator document that I no longer need, but I have no idea how to do that. I don't want to delete all guides, just a particular one. I found this tutorial on Youtube: but it somehow doesn't seem to work in the Illustrator version that I'm using (I have CS5.1).
Maybe you have lock the guide. Try to uncheck View>Guides>Lock Guides. After unlocking the guide, use "Selection Tools (V)" to click on the guide and press "Del" for deleting it.